ryan_asmundson
New member
"I cannot get cyl number three
"I cannot get cyl number three to pick up. I have swapped coils checked grounds and the spark or electrical is not the issue. unit of course revs fine in neutral but what 3 cyl doesn't. here is what I have done. Any more suggestions.
1: Ranged plug gaps from spec (0.039) to 28 thou
2 Completely removed all three carbs, dissembled compared floats checked needle and seat with MightyVac. Reset float heights to yammy spec
3 full inspection of reed valves no problems and no sprayback
4 compression test checked hot and bang on 100 pounds all three.
5 borescope shows slight carbon buildup with nice wash on 1 and 2 but number three is rotally washed.
Timing on all three respectively the same with about 6 degrees atdc at idle.
the problem seems(Even on a lake run wot) that 3 is loading up and full of fuel and won't unload and run. I don't think it is a crank seal because I would not have any primary compression and number three Should have lower compression if the primary transfer was not sufficient. Is there any thing in the ehaust system or restriction that may have occured.
Also idle screws are set at 1.25 turns out. i have also tried all sorts of positions and them.
The engine under wot will only pull 4000 regardless of trim position.(2 Cylinders). I have also done a dropout test to make sure 3 was not -pullin. Any Suggestions would be appreciated"
"I cannot get cyl number three to pick up. I have swapped coils checked grounds and the spark or electrical is not the issue. unit of course revs fine in neutral but what 3 cyl doesn't. here is what I have done. Any more suggestions.
1: Ranged plug gaps from spec (0.039) to 28 thou
2 Completely removed all three carbs, dissembled compared floats checked needle and seat with MightyVac. Reset float heights to yammy spec
3 full inspection of reed valves no problems and no sprayback
4 compression test checked hot and bang on 100 pounds all three.
5 borescope shows slight carbon buildup with nice wash on 1 and 2 but number three is rotally washed.
Timing on all three respectively the same with about 6 degrees atdc at idle.
the problem seems(Even on a lake run wot) that 3 is loading up and full of fuel and won't unload and run. I don't think it is a crank seal because I would not have any primary compression and number three Should have lower compression if the primary transfer was not sufficient. Is there any thing in the ehaust system or restriction that may have occured.
Also idle screws are set at 1.25 turns out. i have also tried all sorts of positions and them.
The engine under wot will only pull 4000 regardless of trim position.(2 Cylinders). I have also done a dropout test to make sure 3 was not -pullin. Any Suggestions would be appreciated"
